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If WINS, WINS replication, or both are necessary for a specific network, drop the requirement to open the ports that WINS requires. If a HOSTS file (for DNS) and an LMHOSTS file (for WINS) name resolution can be adopted, do not open the ports for DNS or WINS on the firewall.

Summary

Note HOST and LMHOSTS files are located in the %windir%\system32\drivers\etc folder on each server. Sample files provide instruction for how to use them.

Remoting methods can be invoked synchronously like traditional methods or asynchronously. The OneWay attribute allows methods to be called and to continue processing regardless of any exceptions that might occur on the server. Processing contin ues without interruption, even if the server is not available. Care should be taken when using the OneWay attribute because it can lead to resource leaks. A delegate that matches the method s signature can be used to invoke a method asynchronously. The IsCompleted method of a delegate can be used to determine when processing has completed. The EndInvoke method of a delegate should be used whenever a return value from a remote method (that was invoked asynchronously) is needed. AsyncCallback objects can be used by a called method to notify the caller when processing is completed.

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Choose the appropriate technique for securing your Active Directory traffic: use full dynamic RPC, limit RPC ports, or tunnel replication traffic. See the sidebar at the end of this list for more information.

The key HKCU\Network contains data about the user's mapped network drives. Each subkey represents a mapped drive that Windows XP restores the next time the user logs on to the computer. The name of the subkey is HKCU\Network\Drive, where drive is the drive letter mapped to the network path. The following values are in each mapped drive's subkey: ConnectionType. This REG_DWORD value specifies how to connect the drive to the local computer. A value of 1 means drive redirection and 2 means print redirection. The default value is 1. ProviderName. This REG_SZ value specifies the connection's network provider. The default value is Microsoft Windows Network. ProviderType. This REG_DWORD value identifies the provider that makes the network connection. The value for the Microsoft LanMan provider is 0x20000. Other network providers use different values. RemotePath. This REG_SZ value contains the network connection's UNC path using the notation \\Computer\Share. UserName. This REG_SZ value contains the user's name, including the domain. It identifies the user who made the network connection, and Windows XP uses it to fill the Connect As box in the Map Network Drive dialog box.

Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.

Tip When creating an IPSec policy to be used for Active Directory replication, the use of authentication is a critical choice. While either Kerberos or machine certificates can be used, if you must perform the initial replication of data when a server is promoted to domain controller, you cannot use Kerberos. When the new domain controller is being created, it does not yet have the ability to use Kerberos for authentication, and the IPSec connection will fail. Ker beros can be used for authentication if all domain controllers have already been promoted.

In the following case scenario, you apply what you ve learned about how to use Web methods and Web services. You can find answers to these questions in the Answers section at the end of this book.

3-20

In the following case scenario, you are the lead developer at a fast-growing company and you must apply what you ve learned to move from your existing client/server application architecture to a robust, scalable enterprise application architecture.

3

The key HKCU\Printers defines the user's printer connections. The following list describes the three subkeys you find in this key: Connections. This subkey contains one subkey for each printer connection The name of the key defines the printer connection: ,,Server,Printer. Also, values in this subkey define the print provider and server. DevModePerUser. This subkey contains per user printer settings. Settings. This subkey contains settings for Add Printer Wizard, including the users' preferences from the last time they used the wizard to add a printer.

Following is a list of company personnel interviewed and their statements:

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